"Computer operating System" Learning Note 2

1. Characteristics of program sequence execution

Sequential, closed, reproducible

2. Characteristics of program concurrency execution

Discontinuity, loss of closeness, non-reproducibility

3, program section, related data segment, PCB (Process Control block) constitute the process entity (process image)

4, the characteristics of the process

Dynamic, concurrency, independence, asynchrony

5. Three basic states of the process

Ready state, execution state, blocking state

6. Suspend primitive (suspend), activate primitive (active)

7, the role of Process control block PCB

As a symbol for the independent operation of the basic unit;

Can realize the intermittent operation mode;

Provide the information needed for process management;

Provide the information required for process scheduling;

Enables synchronization and communication with other processes.

8. Information in the Process Control block PCB

Process identifier, processor status, process scheduling information, Process Control information

9. Two main functions of OS kernel

Support functions: Interrupt handling, clock management, primitive operation

Resource management functions: Process management, memory management, device management

10. Events that cause process creation

User login, job scheduling, service delivery, application request

11. Events that cause the process to block and wake up

Failed to request shared resource to System

Wait for some sort of operation to complete

New data not yet arrived

Waiting for new tasks to arrive

12, the synchronization mechanism should follow the rules

Idle let in

Busy is waiting

Limited wait

The right to wait

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"Computer operating System" Learning Note 2